#include <stdio.h>

int main()
{
    printf("Hello world\n");
    
    printf("%s---%s\n", "celsius", "fahr");
    float fahr, celsius;
    float lower, upper, step;
    lower = 50;
    upper = 100;
    step = 10;

    while (celsius <= upper){

        fahr = celsius * 9 / 5 + 32;
        printf("%7.1f---%6.1f\n", celsius, fahr);
        celsius += step;
    }


    return 0;
}

